Finding the Fourth Proportional to 9,135.69, 12,607.23 and 5,156.79

Step by Step Solution

1. Step 1: Write the proportion equation
   9,135.69 : 12,607.23 = 5,156.79 : x
2. Step 2: Convert to fraction form
   9,135.69/12,607.23 = 5,156.79/x
3. Step 3: Cross multiply
   9,135.69x = 12,607.23 × 5,156.79
4. Step 4: Simplify right side
   9,135.69x = 65,012,837.59
5. Step 5: Solve for x
   x = 65,012,837.59/9,135.69
6. Step 6: Final answer
   x = 7,116.36